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majestic-reasoning

v0.1.0

Review decisions and pressure-test plans and conclusions through retrospectives, devil's advocate, premortem, and reasoning verification.

CodexClaude CodeAgent Plugins4 Skills

By Majestic LabsLicense: MIT0 GitHub starsUpdated 1 hour ago

Directory evidence

Runtimes
Codex, Claude Code, and Agent Plugins
Parsed components
4 skill or MCP entries
Source updated
Aug 27, 2026
Manifest status
Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Install plugin

Installs for the current user
codex plugin marketplace add IchenDEV/agent-plugin-mkt
codex plugin marketplace upgrade agent-plugin-marketplace
codex plugin add majestic-reasoning@agent-plugin-marketplace

Paste and run these commands in a terminal with Codex. They add and refresh the PluginsMP catalog, then install this plugin.

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Get the source manually
git clone https://github.com/majesticlabs-dev/majestic-abilities

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The plugin root is plugins/reasoning/.

Plugin files

plugins/reasoning/
├── .codex-plugin/plugin.json
├── .claude-plugin/plugin.json
├── plugin.json
├── skills/decision-retrospective/SKILL.md
├── skills/devils-advocate/SKILL.md
├── skills/premortem/SKILL.md
└── skills/reasoning-verifier/SKILL.md

Included Skills4

decision-retrospectiveskills/decision-retrospective/SKILL.md

Review a completed consequential decision by separating the quality of the process from its outcome, reconstructing what was knowable at the time, and turning lessons into changed decision rules. Use after a product, strategy, hiring, vendor, architecture, or operating decision has produced enough evidence to learn from. Not for choosing among live options.

devils-advocateskills/devils-advocate/SKILL.md

Pressure-test a preferred approach by exposing hidden assumptions, opportunity costs, confidence gaps, and conditions that favor alternatives. Use when choosing an architecture, tool, strategy, or costly commitment before the decision is locked in, or when the user asks to be grilled about a decision.

premortemskills/premortem/SKILL.md

Run a prospective-hindsight premortem on a concrete plan or costly decision and convert plausible failure stories into safeguards. Use before launches, hires, partnerships, product bets, migrations, or other commitments with meaningful downside.

reasoning-verifierskills/reasoning-verifier/SKILL.md

Verify a completed analysis by tracing original requirements, evidence, and assumptions into its conclusion. Use when reviewing a consequential recommendation, diagnosis, comparison, or decision for omitted constraints, invented premises, or unsupported logical steps.

Plugin manifests3

plugins/reasoning/.codex-plugin/plugin.json
{
  "name": "majestic-reasoning",
  "version": "0.1.0",
  "description": "Review decisions and pressure-test plans and conclusions through retrospectives, devil's advocate, premortem, and reasoning verification.",
  "author": {
    "name": "Majestic Labs"
  },
  "license": "MIT",
  "keywords": [
    "reasoning",
    "critique"
  ],
  "skills": "./skills/",
  "interface": {
    "displayName": "Majestic Reasoning",
    "shortDescription": "Decision review, critique, premortem, and reasoning skills.",
    "longDescription": "Review decisions and pressure-test plans and conclusions through retrospectives, devil's advocate, premortem, and reasoning verification.",
    "developerName": "Majestic Labs",
    "category": "Productivity",
    "capabilities": [
      "Skills"
    ],
    "defaultPrompt": [
      "Pressure-test this decision.",
      "Run a premortem on this plan."
    ]
  }
}
plugins/reasoning/.claude-plugin/plugin.json
{
  "name": "majestic-reasoning",
  "displayName": "Majestic Reasoning",
  "version": "0.1.0",
  "description": "Review decisions and pressure-test plans and conclusions through retrospectives, devil's advocate, premortem, and reasoning verification.",
  "author": {
    "name": "Majestic Labs"
  },
  "license": "MIT",
  "keywords": [
    "reasoning",
    "critique"
  ]
}
plugins/reasoning/plugin.json
{
  "$schema": "https://agent-plugins.org/schemas/1.0.0/plugin.schema.json",
  "name": "majestic-reasoning",
  "version": "0.1.0",
  "description": "Review decisions and pressure-test plans and conclusions through retrospectives, devil's advocate, premortem, and reasoning verification.",
  "author": {
    "name": "Majestic Labs"
  },
  "license": "MIT",
  "keywords": [
    "reasoning",
    "critique"
  ]
}

For maintainers

If you maintain this plugin, link to this source-backed listing from your README so users can review its manifest and indexed components.

[majestic-reasoning on Agent Plugins Marketplace](https://pluginsmp.com/plugins/majestic-reasoning)